<template>
    <div class="com-page" ref="rank_ref">
        takikul
    </div>
</template>

<script>
import { mapState } from 'vuex'
export default {
    data() {
        return {
            chartInstance: null,
            allData: null,
            startValue: 0, // 区域缩放的起点值
            endValue: 9, // 区域缩放的终点值
            timerId: null // 定时器的标识
        }
    },
    created() {
        this.$socket.registerCallBack('rankData', this.getData)
    },
    mounted() {
        this.initChart()
        // this.getData()
        this.$socket.send({
            action: 'getData',
            socketType: 'rankData',
            chartName: 'rank',
            value: '',
        })
        window.addEventListener('resize', this.screenAdapter)
        this.screenAdapter()
    },
    destroyed() {
        window.removeEventListener('resize', this.screenAdapter)
        this.$socket.unRegisterCallBack('rankData')
        clearInterval(this.timerId)
    },
    methods: {
        initChart() {
            this.chartInstance = this.$echarts.init(this.$refs.rank_ref, 'chalk')
            const initOption = {
                title: {
                    text: '▎ 地区销售排行',
                    left: 20,
                    top: 20
                },
                grid: {
                    top: '40%',
                    left: '5%',
                    right: '5%',
                    bottom: '5%',
                    containLabel: true
                },
                tooltip: {
                    show: true
                },
                xAxis: {
                    type: 'category'
                },
                yAxis: {
                    type: 'value'
                },
                series: [
                    {
                        type: 'bar'
                    }
                ]
            }
            this.chartInstance.setOption(initOption)
            this.chartInstance.on('mouseover', () => {
                clearInterval(this.timerId)
            })
            this, this.chartInstance.on('mouseout', () => {
                this.startInterval()
            })
        },
        getData(ret) {
            // const { data: ret } = await this.$http.get('rank')
            this.allData = ret
            // 对allData里面的每一个元素进行排序, 从大到小进行
            this.allData.sort((a, b) => {
                return b.value - a.value
            })
            this.updateChart()
            this.startInterval()
        },
        updateChart() {
            const colorArr = [
                ['#0BA82C', '#4FF778'],
                ['#2E72BF', '#23E5E5'],
                ['#5052EE', '#AB6EE5']
            ]
            const provinceArr = this.allData.map(item => {
                return item.name
            })
            // 所有省份对应的销售金额
            const valueArr = this.allData.map(item => {
                return item.value
            })
            const dataOption = {
                xAxis: {
                    data: provinceArr
                },
                dataZoom: {
                    show: false,
                    startValue: this.startValue,
                    endValue: this.endValue
                },
                series: [
                    {
                        data: valueArr,
                        itemStyle: {
                            color: arg => {
                                let targetColorArr = null
                                if (arg.value > 300) {
                                    targetColorArr = colorArr[0]
                                } else if (arg.value > 200) {
                                    targetColorArr = colorArr[1]
                                } else {
                                    targetColorArr = colorArr[2]
                                }
                                return new this.$echarts.graphic.LinearGradient(0, 0, 0, 1, [
                                    {
                                        offset: 0,
                                        color: targetColorArr[0]
                                    },
                                    {
                                        offset: 1,
                                        color: targetColorArr[1]
                                    }
                                ])
                            }
                        }
                    },

                ]
            }
            this.chartInstance.setOption(dataOption)
        },
        screenAdapter() {
            const titleFontSize = this.$refs.rank_ref.offsetWidth / 100 * 3.6
            const adapterOption = {
                title: {
                    textStyle: {
                        fontSize: titleFontSize
                    }
                },
                series: [
                    {
                        barWidth: titleFontSize,
                        itemStyle: {
                            barBorderRadius: [titleFontSize / 2, titleFontSize / 2, 0, 0]
                        }
                    }
                ]
            }
            this.chartInstance.setOption(adapterOption)
            this.chartInstance.resize()
        },
        startInterval() {
            if (this.timerId) {
                clearInterval(this.timerId)
            }
            this.timerId = setInterval(() => {
                this.startValue++
                this.endValue++
                if (this.endValue > this.allData.length - 1) {
                    this.startValue = 0
                    this.endValue = 9
                }
                this.updateChart()
            }, 1800)
        }
    },
    computed:{
        ...mapState(['theme'])
    },
    watch:{
        theme(){
            this.chartInstance.dispose()//销毁当前图标
            this.initChart()
            this.screenAdapt()
            this.updateChart()//更新图表数据 屏幕适配
        }
    }
}
</script>

<style lang="scss" scoped></style>